Pneumatic tire for vehicles and method of making the same.



l. S. MCGIEHAN v PNEUMATIC TIRE FOR VEHICLES AND METHOD OF MAKING THE SAME.

.APPLICATION HLED OCT. 10.J9I6. 1 25,344. Patented May 8,1917.

2 SHEETS-SHEET 7 UNITED STATES PATENT OFFICE.

ISAAC S. MoGIEI-IAN, 0F MOUNT VERNON, NEW YORK.

PNEUMATIC TIRE FOR VEHICLES AND METHOD OF MAKING THE SAN E.

,To all whom it may concern Be it known that I, ISAAC S. MoGmnaN, a citizen of the United States, residing at Mount Vernon,- in the county of \Vesteheste-r and State of New York, have invented a new and useful lm n'm'ement in lnelunatie Tires for Vehicles andMethods of Making the Same, of which the following is a specification.

This invention relates to pneumatic tires for '\"el1icles,-partienlarly that class of tires known as the single tube or hose pipe .tire. It also relates to an improved method of making the tire the method heretofore used having made the single tube tire for automobilesa failure.

It has for its object several distinet teatures:

' First: To have the tire built over a solid cylindrical core, with its closing joint so arranged that the fabric in the tire cannot be ruptured, bent or distorted in, any form, when the joint is closed. I

. Seqondi Theelosing joint of the tire be-- ing put together under great pressure so there can be no doubts as to securing a positive homogeneous and insepm able union between the. parts.

Third: The molding and Yul02111izing ot' the tire while it contains a'iery high internal air pressure, thus forking the fabric and rubber outward against the mold and closing every infinitesimal. pocket that may ex istbetween the layers of fabricbeeause of imperfect rolling. by an equal air pressure against tlni -avh ole interior surface of the tire.

My invention-is illustrated in" the aceom panying drawings which form a part of this specification and containsimilar letters of reference to indicate the corresponding parts as follows:

Figurelrepresents a tire after ithas been built'up on a separable core number 1. The white portionsQ and Q5 representing the (lea r rubber compound without fabrie. and the dotted of fabric as the) are laid up over the separable core 1. 5 Fig. 11 represents the tire a ti r the separable core has been removed and the uniting edges 3 and 3 are'brought together by the mold 4, showing that the pressure which unites the edges 3 and 31s sufiieient to. forcethe'f-surplus rubber to form a run or bead 5 on the inside of the tire.

Specification of Letters Patent.

through which the eore may be portion 33. representing the layers Patel lted Ma 8, 1917.

Application filed October 10, 1916. Serial No. 124,871.

after it is vul ta-nized and mom red on the folly (l and clamped in plane b the rims 7 and 7, held together with the desired amount ()f'Pl'PSSlllG by the bolt 8.

Fig. IV represents the unitingx-dgea ll and t-l showing the manner in \rhi. l the upper points elose first, in. order thatas the pressure is exerting on the beads as at 9 Fig. ll, the air will be forced out at the bottom and the two eontaetiug edges will be firmly and hermetirally united.

Fig. V illustrates the the uniting edges 3 and ressed by the mold l srribed.

Fill. el'l illustrates the method of insertsame seetion after 3 have l'ieen nonras prenousl deing, the Valve 10 before the uniting edges 3 and 3 are brought togethein- Fig. Yll illustrates the valve it) in posi tion afterthe joints have been united and vulcanized.

The only economic heretofore in making the single tube or=hose type tires; has been to build, the tire up on a long straight mandrel after which the two ends are brought together and spliced (the same as the ordiu: inner rubber tubes made Malay), then for ring it in a mold and inflating it to a limited. extent, with'gas or air. In doing this. the fabric is not only crimped ,aml lmehled, but the layers are separated and distorted to snob an extent that the internal pressure while forcing the tire out against the mold, never re-nnites the parts properly and that method finally had to be abandoned.

In my present invention as shown in Fig. I all these diiiieulties have been overcome by building the tire ou-a proper metal core ordinary shoe or easing oi. the

presentda is constructed, but leaving an opening removed. The process being to put kner the mandrel first, a layer of rubber as 2, which is approximately as thirlr as the ordinary single tube of the. present day. This la fier of rubber rolled down on the eore. so that its inner surface absolutely smooth against the core. 1. On top of this layer of rubber; thefabrie shown by the dotted lines 33. is rolled down in the same manner.

n'xethod employed Thus that portion of the fabric which forms the upper or tread side of the tire. is sufiiciently ."longer than that portion irhieh forms the Fig III illustrates the tire when finish-ed c is erfect .structure without stretching or buckling the fabric in any direction, after the tire isfornied. j

The fabric employed is of course first 5 spread or impregnated with rubber to fill the fabric and leave a coating of rubber on the outside suiiicient to make it unite with the fabric, which is already rolled 'in place. On top f each layer of fabric beginning with the layer which covers the rubber 2, next to the core, is a thin film of rubber, and after this another layer of fabric,so on alternatively, until the desired number of layers of fabric are applied to resist the internal pressure when the tire is inflated, each layer of course, having been rolled separatelye-the number. of layers being .varied according to the thickness and tensile-strain of the fabric,also the size of the tire.

. I mayalso add that in some cases the layers ofthis'rubber between the layers of fabric may be omitted if the fabric carries ;;5 with the rubber when it begins to How under the heat and pressure during the process of vulcanization.

built up the tread and side 'wall'rubber 25, is stretched over that portion of the fabric heretofore described and as shown in Figs. I, 'II and III. 1

After this is accomplished the side molds 4,' Fig. I, are applied and put under pressure sufiicient to mold'the tire into the form illustrated in Fig. I, leaving the space 11 between the uniting edges 3 and 3., \Vhen A this 'has'been accomplishedand the tire thus formed,i, one of the side niol'dsB I, is re. moved andthe core 1, is taken-out. The -tirethu,s",formed islifted from the remaini i'ng sidemold 34, andplaced within one of the side; inolds -1- Fig. II. This having been grdone,(semi-depression 12 and 12 having been formed, while the tire was being :pressedoncore 1,'as as in Fig. I), the valve 10 'is-laid' within the 'semigdepression and nd'pressure applied to bring the joints of he molds 13 and 13 firn'ily: together.

LII! this way thevalve is embedded in the tflrnbb'er dough in which the valve will justfitself as the two edges are brought gether. when the ressurc is'ap ph'ed tothe molds 4 and 4, Fig. II, the valve Lwillbe in a fixed position as shown in Fig. zuirlthe two uniting edges 3 and 3 will have'been perfectly joined as shown in Figs.

suflieient coating of rubber to fill the fabric- {the opposite mold l-Fig. IIfis put in place II III'-and V. .Ihus the internal or air sure .up to 100 or more pounds is pumped through the valve '10. The valve is then closed and the whole is put in the vulcanizorto cure.

In this way, as the air in the tire oxpands with the heat, the pressure will be. increased and the layers'ot' uniting fabric will be forced outward flat against the molds, or in that direction and should any portion of the fabric ltVdllBilllH of in pcrfect weaving or rolling, fail to get the proper adherence to its neighbor, the pressure of air will cause the flowing rubber to ized rubber slliliciently hard to form a solid I seating portion which can easily be retalned in position by means of the clamping v 1 rim 7, without being compressed unduly or After the desired thickness of fabric is sufiici-ent for the tire to become detached.

The hardness of the seat 15 and the black core 16,-does not'in any way tend to harden the rubber above the core 16, or that portion. of rubber which encircles the valve, the lower or seating portion 15 is practically as hard as gu-tta percha, while the inside portion 17 above the black cor is very soft and, yielding.

As-illustrated in Fig. III, the metalrim 18, which surrounds the felly 6 of-the wheel, is beveled outwardly in two directions, and the under portioiiof the lifting web 19 of .the rim 7 is beveled to correspond. It will also be seen that the upper side of the lifting web 19 is tapered inwardly to corre spend with the formation of the seat of the tlre. ,Thus when the tire is being mounted it is supposed tofit closely on the center of the metal rim 18. The web 19 of the metal rims 7 is inserted between the metal rim 1'8 andthe seat of the tire 15,an'd as they are brought together by the bolt 8, the tire is stretched sufiicient for the sides of the rim 7 to clamp the fell) closely. I'n'this way,

tion, that displacement impossible.

Referring tothe insertion of'the' valve 10, as illustrated in Fig. VII, the surface of the valve is provided with rings or circular In addition to this, the valve is tightened .,With a nut 21, providedwith aficircular lip. 1 22, corresponding with a circular lip 23, on

the underside of the head of the valve. The

' the'seat of the tire s so firmly held in posinut 21, is screwed into place after the tire is vulcanized, which draws the circular li s 22 and 23, toward each other and into t e vulcanized rubber, which forms an additional safeguard against the possibility of, leakage.

Having thus described myinvention, what I claim and desire to secure-by Letters Patent, of the United States, is:

1. A single tube pneumatic tire formed of layers of fabric and rubber having uniting edges, a cylindrical strip of rubber between the edges of the fabric where the structure is integrally united, and a valve vulcanized within said strip of rubber.

2. A'single tube neumatic tire formed of layers of fabric an rubber constructed with circular uniting edges where the tireis joined together durixi the process of vulcanization, and a suitable valve for inflating the same, substantially. as specified. 3. The herein described method ofconstructing a single tube pneumatic tire which consists of first formin i the tire, over a circular collapsible core eaving an opening from which the core may be removed then oiniug the said edges at the o ning, and, y means of a suitably inserte valve, inflatin the tire within a mold for vulcanizing as escribed.

4. The herein described method of conunite rmly, a suitable valve for inflating' the tire within the mold and vulcanizing with internal pressure substantially as described;

In testimon that I claim the forefifing specification, have hereunto set my and this 9th day of October, nineteen hundred and sixteen.

ISAAC S. MOGIEHAN. Witnesses: v

E. ADELMAN, L. R. Manama. 

